The stock/recoil spring tube will unscrew from the receiver, but it is loc-tited in place and would need to be carefully heated first. But is is not necessary to do this to replace the recoil spring. The spring is held in the tube by a threaded cap in the back of the tube (also loc-tited) which needs to be unscrewed (being very careful to contain the spring). You may need to heat the rear of the tube to free the loc-tite (using hair dryer, etc) then unscrew the cap carefully. The tube has a pair of holes in it near the top where you can insert a small rod or the like to contain the spring from popping out as you remove the cap. Just do the whole thing carefully so as not to twist or distort the tube. Bolt, etc and trigger group should be removed before doing any of this of course. Springs are available from Coles, Beretta, Brownells, etc. I have several different springs I use depending on loads I am using (lightened spring for really light 3/4 ounce loads for instance) and often change out springs. Not a difficult job, but just take your time and use caution. Stock comes off easily by removing nut from stock retaining bolt (which is a part of the tube cap by the way) although you may have to find the proper tool to get down into the stock to reach the stock bolt nut.